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1. China – 1.37 Billion
2. Facebook – 1.32 Billion
3. India – 1.21 Billion
4. WhatsApp – 500 Million
5. WhatsApp – 438 Million
6. United States – 319 Million
7. Google + – 310 Million
8. LinkedIn – 300 Million
9. Twitter – 275 Million
10. Indonesia – 250 Million
* inspired by a Tweet, based on Google search results on 23.10.2014